In which of the following equilibrium Kc and Kp are not equal?

If the equilibrium constant for 
straight N subscript 2 space left parenthesis straight g right parenthesis space plus space straight O subscript 2 space left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon space 2 space NO space left parenthesis straight g right parenthesis space is space straight K comma space the space equilibrium space constant space for
1 half straight N subscript 2 space left parenthesis straight g right parenthesis space plus space 1 half straight O subscript 2 left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon space NO space left parenthesis straight g right parenthesis space will space be

  • K1/2

  • K/2


A.

K1/2

As we can see the reaction for which we have to find out equilibrium constant is different only in stoichiometric coefficient as compared to the given reaction. Hence, we can find equilibrium constant as,

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In which of the following equilibrium Kc and Kp are not equal?

  • 2NO (g) ⇌ N2 (g)  + O2 (g)

  • SO2 (g) + NO2 (g) ⇌ SO3 (g) + NO (g)

  • H2 (g) + I2 (g) ⇌ 2 HI (g)

  • H2 (g) + I2 (g) ⇌ 2 HI (g)


D.

H2 (g) + I2 (g) ⇌ 2 HI (g)

The reaction for which the number of moles of gaseous products (np) is not equal to the number of moles of gaseous reactants (nR), has a different value of Kc and Kp.

a) np = nR = 2 thus, Kp = Kc

b) np = nR = 2 thus, Kp = Kc

c) np = nR = 2 thus, Kp = Kc

d) np = 2, nR = 1 thus, Kp not equal to Kc

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An aqueous solution of which of the following compounds is the best conductor of electric current?

  • Acetic acid C2H4O2

  • Hydrochloric acid, HCl

  • Ammonia, NH3

  • Ammonia, NH3


B.

Hydrochloric acid, HCl

HCl is strong acid and dissociates completely. Hence, it conducts electricity best in its aqueous solution.

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If pH ofa saturated solution of Ba(OH)2 is 12, the value of its Ksp is 

  • 4.00 x 10-6 M3

  • 4.00 x 10-7 M3

  • 5.00 x 10-6 M3

  • 5.00 x 10-6 M3


C.

5.00 x 10-6 M3

Given pH of Ba(OH)2 = 12
therefore, [H+] = [1 x 10-12]
and [OH-] = 1 x 10-14 / 1 x 10-12   {[H+][OH-] = 1 x 10-14}

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What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH? 
(Ka for CH3COOH = 1.8 x 10-5 )

  • 3.5 x 10-4

  • 1.1 x 10-5

  • 1.8 x 10-5

  • 1.8 x 10-5


D.

1.8 x 10-5

CH3COOH (weaK acid) and CH3COONa (conjugated salt) form acidic buffer and for acidic buffer,

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